Magnetic moment investigation by frequency mixing techniques

Area of Science:

• Materials Science
• Non-destructive Testing
• Industrial Engineering

Background:

• High-temperature oxidation and corrosion pose significant challenges for industrial equipment like gas turbines.
• Assessing the depletion state of protective coatings during operation is crucial for equipment maintenance.
• Existing non-destructive methods for measuring coating depletion are lacking practical application.

Purpose of the Study:

• To develop a novel, non-destructive technique for measuring protective coating thickness using magnetic properties.
• To design and test a sensor system based on frequency mixing for enhanced coating analysis.
• To overcome distance-dependent measurement limitations inherent in non-contact techniques.

Main Methods:

• Integration of magnetic phases into protective coatings.
• Utilizing frequency mixing for magnetic property analysis.
• Development of a novel sensor system with high sensitivity and selectivity.
• Implementing new approaches to mitigate distance dependency in measurements.

Main Results:

• A new frequency mixing technique was successfully applied to investigate coating thickness.
• A low-cost, high-sensitivity, and high-selectivity sensor system was designed and tested.
• The sensor achieved high signal-to-noise ratios, demonstrating practical viability.
• Methods were developed to overcome the coil-to-sample distance dependency.

Conclusions:

• The proposed magnetic sensor offers a promising non-destructive method for assessing protective coating thickness.
• This technology can significantly improve the monitoring of industrial equipment health and maintenance scheduling.
• The developed sensor presents a cost-effective solution with high performance for industrial applications.